Thanks everyone. What I'm going to do is a few sound tests - recording direct into the mic/line input, then the same piece into a USB interface. See which one comes out sounding best. The laptop, as you've suggested runs and records perfectly... it seems to be a great little until - so slick. Just need to get the best recorded sound possible so it'll come down to the soundcard Vs USB interface issue. Will post up results!
thanks for asdvice, though chaps - really useful - pulled the trigger on this the other day based on your helpful advice. One of the best, and cheapest, option for PC recording! Nice one.